I have been searching Archive.org an downloading many Grantham and Manipravala books .Lot of such books were published ill 1960s. Some books are fully sanskrit i.. Grantham , some mixture of Grantham and Manoprvalam
For example Dasopanishad with Dravida Bashyam published in 1899.
The question is, can they be reprinted as it as , with acknowledgements to the source, without infringing Copyrights
Some of these books are in good condition i.. readable. Some of hem readability is reduced due to quality of pages or quality of scanning
Regards
Vijayaraghavan